Improvement in saw-filing machines



W. s. NEWTON. SAW-FILING MACHINE.

No.178.8 7Z. Patented June 20,1876.

WITNESSES,

. 'lNv"ENTo,H.-

a} Wart/mm WILLIAM S. NEWTON, OF NORWICH, CONNECTICUT.

IMPROVEMENT IN SAW-FILING MACHINES.

Specification forming part of Letters Patent No. 178,872, dated June 20,1876; application filed August 13, 1874.

the file is caused to operate upon all the teeth alike, without regardto the pressure in bold ing the machine, by which means the teeth may becut to any depth desired much more accurately, much easier, andrequiring much less skill to operate it.

Figure 1 is a side view of the ordinary sawfiling machine, with myimprovements, attached upon it, in position upon a saw, as in use. Fig.2 is a side view, and Fig. 3 is an edge view, of the ordinary rotaryfile, detached from the machine, with my improved switch adjusted uponit. Fig. 4 is a side, and Fig. 5 av bottom, view of my improved rest andgage, showing the mode of its attachment and adjustment upon the frameof the machine.

A is the frame of the saw-filing machine, which is made in the ordinarymanirer, except that I have secured the handle B upon its top, by whichthe whole machine may be held firmer, and operated with'much lesseffort.

C is my improved rest and gage, which has its upper end slotted, andthrough which the screw'D is inserted into the frame of the machine. Italso has the longitudinal groove in its face to slide upon the' featherorjguide a, made upon the bottom of the frame, which,

with the screw D, firmly secures the rest in any adjusted position.

c is a semicircular piece, pivoted in the lower end of the gage C, whichrests upon the sawteeth, and gages the depth in which the file can act.

E is the ordinary notched rotary file, and c I is my improved switch.This switch is made as shown in Fig. 2, and firmly secured upon the faceof the file by the same screw which fastens on the file. This switch hasits rear edge just catching against the rear edge of the notch in thefile, and has its front inclined forward with a shorter radius, so as tocatch into and draw back the next tooth; and while drawing it back theswitch is pressed closely against the edge of the notch, so that thetooth slides smoothly off the switch onto the file.

This construction of the switch makes it very strong and unyielding, sothat the edge WILLIAM S. NEWTON.

Witnesses:

J. B. ROGERS, WEBSTER PARK.

